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Materials used: A) 22 G Chiba needles; above: 20 cm needle for puncture in the L5-S1 space; below: 15 cm needle for puncture in the higher spaces L3-L4 and L4-L5. B) 20 ml syringe for O2-O3 injection; filter to eliminate impurities and a 5 ml luer-lock syringe for injection of steroid and local anaesthetic.
